In fields such as pharmaceuticals, semiconductor manufacturing, and biological laboratories that require high environmental cleanliness, the air quality in sterile workshops directly determines product quality and production safety. As a core device for monitoring air cleanliness, the dust particle counter accurately detects the concentration and particle size distribution of suspended particles in the air, providing key data for cleanroom level certification, pollution source tracing, and process optimization. This article focuses on JuchuangY09-3016Taking the handheld six channel dust particle counter as an example, this article systematically explains its working principle and core precautions in use.

1、 Working principle: Precision application of light scattering technology

Y09-3016Type dust particle counter based onMie's light scattering theoryParticle counting and size analysis are achieved through the interaction between laser and particulate matter. Its workflow can be divided into three stages:

Optical signal excitation: The built-in laser diode emits a stable wavelength laser beam, which is focused by a lens group to form a uniform optical field inside the measurement cavity. When particulate matter in the air follows the sampling airflow (flow rate)2.83L/min）When measuring the cavity, the surface of the particles will scatter laser light, and the intensity of the scattered light is proportional to the surface area of the particles.

Optoelectronic Conversion and Signal Processing: Scattered Light90°After being collected by a corner collecting lens, it is converted into an electrical pulse signal by a photomultiplier tube or photodiode. The amplitude of the electric pulse directly reflects the particle size (such as0.3μmParticle correspondence69mV，0.5μmcorrespond to531mV）The number of pulses corresponds to the particle concentration. The instrument amplifies and identifies signals through electronic circuits, eliminates noise interference, and only retains effective particle pulses.

Data output and display: The processed electrical pulse signal is classified and counted by the counting system, and the LCD screen displays six channels in real-time（0.3μmThe0.5μmThe1.0μmThe3.0μmThe5.0μmThe10μm）Particle concentration (particles)/m³）And support95%置信上限（UCL）Calculation, direct matchingISO 14644-1Cleanliness classification standards.

2、 Precautions for use: Ensure detection accuracy and equipment lifespan

Self purification and pipeline inspection before sampling
Before starting the instrument, a self-cleaning program needs to be run（≤20Remove residual particles from the air path in minutes. The sampling tube should use an isokinetic sampling head to avoid bending or being too long (recommended)≤1.5To prevent particle deposition or repeated counting caused by turbulent airflow. For example, when detecting cleanroom transfer windows, if the bending radius of the sampling tube is too small, it may cause0.5μmThe above particles remain in the tube, causing data deviation.

Environmental adaptability control
The instrument should be at a certain temperature15-35℃Humidity10-85%RHUse in a clean environment and avoid operating in high temperature, high humidity, or strong electromagnetic fields. When detecting compressed air, a high-pressure pressure reducing valve must be equipped to ensure that the sampling pressure is close to atmospheric pressure, preventing overload of the air pump or rupture of the sensor diaphragm.

Isolation and protection of pollution sources
The detection point should be kept away from dust sources such as painting and polishing at least30cmTo prevent large particles from blocking the sampling port or contaminating the optical cavity. If it is necessary to detect environments containing oil mist and corrosive gases, it is necessary to confirm the equipment protection level with the manufacturer in advance or select a dedicated protective kit. For example, during testing in a chemical workshop, acidic gases may corrode the gas path sealing ring, leading to gas leakage or data distortion.

Operating standards and safety protection

Do not start the instrument when the inlet pipe is blocked, otherwise it may cause overheating and damage to the vacuum pump.

When connecting an external printer or temperature and humidity sensor, the instrument power should be turned off first to avoid surge impact on the circuit board.

When detecting mixed gases of hydrogen and oxygen, it is necessary to ensure that the equipment has explosion-proof certification, otherwise it may pose a risk of explosion.

Maintenance and calibration cycle
Regularly use standard particle generators to calibrate equipment and ensure particle size detection errors≤10%Repeatability≤20%The air path filter3Replace once a month to prevent0.3μmThe above particles penetrate the filter material and contaminate the optical sensor. When idle for a long time, it should be powered on and operated every month1To prevent battery over discharge or circuit moisture.

3、 Application scenarios and value extension

Y09-3016Typical applications of type counters in sterile workshops include:

Cleanroom level certification: matched with six channel dataISO 1Level up to9Level standards, validationHEPAFilter efficiency.

Dynamic pollution monitoring: Real time monitoring of particle concentration in key areas such as air shower rooms and laminar flow hoods, warning of filtration system failure.

Process correlation analysis: Combining temperature and humidity data, trace the correlation between particle exceedance and equipment operation and personnel operation.

This device, through technological innovation and standardized use, can significantly improve the reliability of sterile workshop environment control and safeguard product quality.